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It is an important intermediate in the citric acid cycle, where it is synthesized from α-Ketoglutarate by α-ketoglutarate dehydrogenase through decarboxylation. During the process, coenzyme A is added.
It is also synthesized from propionyl CoA, the odd numbered fatty acid which cannot undergo beta-oxidation. Propionyl-CoA is carboxylated to D-methylmalonyl-CoA, isomerized to L-methylmalonyl-CoA, and rearranged to yield succinyl-CoA via a vitamin B12-dependent enzyme. Succinyl-CoA is an intermediate of the citric acid cycle and can be readily incorporated there.
It is converted into succinate through the hydrolytic release of coenzyme A by succinyl-CoA synthetase (succinate thiokinase).
Succinyl CoA can be formed from methylmalonyl CoA through the utilization of deoxyadenosyl-B12 (deoxyadenosylcobalamin) by methylmalonyl CoA Mutase. This reaction, which requires vitamin B12 to occur, is important in the catabolism of some branched-chain amino acids as well as odd-chain fatty acids.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Succinyl-CoA". A list of authors is available in Wikipedia.|